Am 02.04.2021 um 04:43 schrieb Ryutaroh Matsumoto:
To access USB devices on RPi4B, initramfs must load reset_raspberrypi.ko, as https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977694 I hope it fixes your problem. Best regards, Ryutaroh Matsumoto
Thanks a lot, Ryutaroh, it indeed did fix my problem. And thank you for filing and working on this bug. All the best, Ralph